Reversible close-quarter drill



Sept. 9, 1930. I R. A. NORLING 1,775,406

REVERSIBLE CLOSE QUARTER DRILL:

Filed A ril 20. 1929 s Sheets-Sheet 1 wiz P 9, 1930. R. A. NORLING 1,775,406

REVERSIBLE CLOSE QUARTER DRILL Filed April 20, 1929 3 Sheets-Sheet 2 Sept. 9, 1930. R. A. NORLING REVERSIBLE CLOSE QUARTER DRILL Filed April 20, 1929 3 Shuts-Sheet 5 w ,0. d V w w 1 w u v A? Q m I I I 'I A llmlil i1 Ml ll l ll sectional View taken through a closeeuarter D? S T S Patented Sept. 9, 1930 REIJNHOLD gra me, or AURQRAyILLINQISI AssIGNoa T INDEPENDENT mm.

MA'rIo TOOL COMPANY, 0F, CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE g 1 nnvnnsrnte ono'snf-ouan'runpmnn li pncatibnlhled April 20,

This invention relates to'i-mprovenients in portable power operated close quarter drills, such as are'de'signed for use in angles and between adjacent walls and structural HlQHP bers.

i In these drills, the spindle of each drill has rotarymovement imparted thereto'loy a lever and pawl arrangementpthe pawls being carried by'the levers and acting on ratchet teeth on the spindle to turn the same. To rotate the spindle in opposite directions,'re-

versely' arranged pawls are used, one'set for turning the spindle in one direction andthe other set for turning the spindle in; the opposite direction. l a

In accordance with my j present invention I provide means associated with thepawls for alternately lifting and holding them out of driving engagement with" the teeth of the spindleon reversing'the direction of rotation of the motor of the drill so that only the pawls of the set required for turning the spindle in y the desired direction, will be allowed to operate. it a l 'In carrying out this object, I provide a novel form of automatically operated pawl shifting and lifting means which islconupact More specifically ,1 proyide cam means foras well as simple in construction and which will not add tothe overall dimension of the drill to fincrease it beyond the size required 1 for close quarter use.

I shifting the pawls an'dfri'ction operated means on a crank shaftofthe drill to automatically shift the cam means as the shaft changes itfclirection of rotation on being reversed "a I also provide meansforadjusting thejfric tion so as to take up the wear and thus e115 able the parts to healwaysin condition, to operate. 1 The invention consists further in the matters hereinafter described and claimed; Intheaccompanying drawingsf Figs. 1 and 1 are a combined longitudinal drill embodying the features of my invention; Figs. 2 and 3ar similarsec'tional views takenon lines 2 -2 and respectively ofFigzl;

1329. seminal 35am; I

- Figs. rand 5am views; showing how the cams alternately liftan d h'old the pawls out of driving engagement withthe spinlde; Fig. 6 is sectional View taken online 66 ofFigf5; and I i Q Figs. 7 and 8 are face viewsof the shifter plate, onewitlfthe camson tliesarne and the other witlithe cams ofi; pp

InFigs. 1 to 3; 1 indicates thejvelongated main outer casing of the drill, and 2 indicates the'diulltspi'ndle which is; journaled n the casing 1 at one end thereoflandentends transversely across the same. The spindle 2feX-1 tends beyond one side of the casing and may be fed toward and from the work by a feed screw assemblyB whichis mounted in'the casingat the otherend of the spindle. The i if opposite end of the spindle islm ade hollow and tapered to accommodatethe drilLbit with which the workis perforihedlj y The spindle 2 is rotatedl throughthe rile diu'm of a reversiblemotor {twhich is secured to the casing 1 at its end opposite the'spindle 2L As shown in the drawings, itheiinotor 4 is of the fluid actuated type and hasits'douhle acting pistons 5, 5 connectedwith 'a crank shaft 6 which extends across the inside of the casing 1, and is journaled therein between,

the motor 4 and the spindle 2. a The valves 7,

7 (F 3) for controlling thefinlet ande x haust of motive fluid such as compressed air, tothe pistonsfi, 5 are actuated by eccentrics on the crank shaft 6- as customary in drill design. The supplyan'd exhaust of the rho-Q tive fluid ,to and from the motor 4 is cone trolled through a throttle valve 8 turnaloly mounted on a throttle jstemor tube 9 which;

is secured tojthe motor casinght asshown in- Fig.1? Theputer end ofthe stem 9 is connected to the motive fluid supply hose (not shown) and the construction of the stem and the'valveS are such that on turning the valve in opposite directionsthe flow of motive fluid to and from the met r may be changedas to reverse;the,action ofthe motor and thus turnlt he' spindle 2 in opposite di rectionsg l a 'p at y A sup lementalrrank shaft 10 is journaled within the casing 1 between the spindle 2*and the main crank shaft 6,there"being intermeshing gears 11, 12 on the respective shafts to transmit power from the shaft 6 to the shaft 10 in the rotation of the former by the motor 4. A pair of ratchet levers 13, 13 are loosely journaled on the spindle 2 within the casing. 1 in side by side relation and each lever has a slot: 14 through which the cranks of the driving shaft 10 extend. Blocks 15, 15 are mounted on the cranks of said shaft and work, one in eaclislot 14;.so as to oscillate the levers 13, 13 hack ancL-f'orth in the rota tion of the shaft. Each lever carries a pair of pawls 16, 16 which workin recesses 17-, 17' in the levers and are forcedagainst the spindle 2 through the open ends oftlie recesses at the spindle byspring pressed plungerslS, 18 carried by the levers, .one for eachpawl. The pawls on eachleverrare reversely= arranged so as to alternately. engagertheteeth.19,19 on the spindle 2 for turning the spindle .inxopposite directions. H

Arranged between the ratchet levers 13,13 is a relatively thin flat plate 20having an opening: 21. through 1 which :the spindle 2. extends. The plate 20* extends toward the crank shaft 10 andzis there .provided witha. number of gear teeth 22 ,onopposite sides of which are plain portions forming shoulders 23, 23. Theratchet levers 13,.13hear. against the opposite sides of the plate 20land iare held againstthe same by shoulders onthe outer sides of the levers andcarriedby the drill case 1. The shoulder for: one lever is provided. by the inner end ofa hearing. bushing 24 for the spindle 2 andthe shoulder for the other lever is. provided, by the: side of: the innermost ring, 25' of the, thrust bearing, for the inner end of said spindle.

Cams 26,- 26 in the form of segment. strips. are arranged on opposite sides ofthe plate 20 at the pawls 1.6, 16 and are secured'to the plate so as to be moved therewith in. the shifting: of the plate in opposite directions. The plate 20 is provided with a series of notches 27, 27 to receive lugs 28, 28 on-tlie strips 26 so as to key the strips to'thep'late and prevent. them from having movement relatively thereto. The strips are riveted through theinotclies 27, andfare thus clamped against the opposite sides-of the plate. The levers 13, 13are recessed .at 30-on their. inner. sides to.acc.ommodate the strips 26 and allow the levers to work against the sides of the plate 20 and alsoto bring the strips into posi'-- tionto lift the pawlsin the shiftingofthe plate. The pawls 16, 16are milled'out', as

at 31 at their bitingend's next; the plate 20.

19i'on. the spindle 2 The recesses 31' also. prevent" lifting the pawls any more. than.

necessary to clear. the. teethzofthespindle.

Mounted on. and surrounding.- the center.

portionof; the. crank. shaft: 1(1Lis,v device.

for shifting the cam plate 20. Said device comprises a segment 33 and a retaining strap 34 therefor. The segment has a number of teeth 35 to mesh at the proper time with the teeth 22 on the plate 20. The portion 32 of the shaft 10 is concentric with its end journals so that the segment 33 when moved by the shaft 10 will turn in an arc of a circle thereof. The strap 34 has one end fitting ina recess 36 on the inner side of the segment 33 asshown inFig. 2. The other end of the strap 34 is turned outward as at 37 through which extends a bolt 38 which is pivotally connectedwith the adjacent endof the segment' 33. 39 is a nut threaded on the bolt 38 and engaging acoiled spring 40 about the bolt between the nut and. the end 37 of the strap so as to adjust tension of thespring on the clamp.v Blocks-41,42 of wood or other desired friction material are riveted or otherwise secured to theinner side of the segment 33 and the strap 34, respectively, and are held with suflicienttension. against the center portion 32 of the: shaft 10 by the-spring 40;

The structure shown and describechoperates as follows: Themotor '4 beingreversible, the spindle 2 may be run in opposite directions. This is brought about by turning the throttle valve8in the required direction. The segment 33 having frictional engagement with the shaft 10 wilLturn with the shaft on reversing its direction. ofrotation and in so doing. willshift the cam plate 20 by. reason of the mutilated. gear connection between them. The. movement of, both 4 however, will stop as soon as-theapproaching ends 'of the plate 20 and the segment 33.beyond the teeth come together.. As soonas this-happens, the plate 20 will stop further rotation ofthe segment. 33. with the, shaft 10 because the holding. power of: the plate on.the segment is suihcient to overcome the tension of; the. spring 40, and the shaftv 10. will continue to:rotate with respectto the segment. On reversing the shaft 10 by reversing'the motor 4, the segment will be free of.the holding power. of the plate, and the segment will. turn withthe shaft because of. the tension ofzthe. spring40 onthe segment: The. segment. will stopas soon as the. other approaching. ends of the segment andplate. come together as described. In shifting the plate 20, the cams '26-thereon will alternately. lift: the pawls out of driving engagement with the spindle and hold out the lifted pawls'during. the. action of the others on the spindle as indicated in Figs. 4 and 5.. The pawls which. are held out will havea: slight. rubbing. action on the cams engaged. thereby. due to the swinging action of the levers 13. The segment 33requires very little tension on theoranklO just enough-to be shifted. This tension may he adj ustedfrom timeto time to'compensate. for

the nut 39 on the spring 40.

the reversing mechanism described the intermittent grip: devices,-as-provided by the pawl and lever arrangement cahjbe retained ously changed and modified without depart ing from. the spirit and scope" of my invention: 1 I claim as myinvention: A i i r111 combination in a :portable power driven tool, a rotary spindle, reversible motor, means providing a driving connection from 'the motor to the spindle, said means including intermittentgrip devices for rotate ing the spindle in opposite directions, and means acting automatically on reversingthe motorto change the direction of rotation of the spindle through said grip devices. g

- 2. In combination in a portable power driven tool, a rotaryspindle having ratchet teeth,-a reversible motoig'means providing a drivingconnection from the motor to the spindle, said.meanspiincluding reversely ar ranged *pawls for rotating the spindle in opposite direotionsythrough said teeth, and means acting automatically on reversing the motor for alternately lifting the pawls out of driving engagement with the spindle.

3. In combination ini-a portable power driven tool, a reversible shaft, a rotary spindle having ratchet teeth, means providing a driving connection from the shaft to the spindle,said means including reversely ar ranged pawls for rotating the spindle in opposite directions through said teeth, and

means influenced by the rotary movement of the shaft on changing its direction of rota:

tion to alternately lift the pawls out'ofdrivingengagement with the spindle.

4. In combination in a portable power driven tool, a reversible shaft, a rotary spindle having ratchet teeth, means providing a driving connection from the shaftto the spindle, said means including reversely arranged pa-Wls for rotating the spindle in 0pposite directions through said teeth, a shiftable plate, means on the plate to alternately lift the pawls out of driving engagement with the spindle on shifting theplate in opposite directions, and means influenced by the rotarymovement of theshaft on changing its directionof rotation to shift the plate in oppositedirections. i

5. In combination in a portable power driventool, a rotary spindle having ratchet teeth, a reversible shaft, means providing a driving connection between the shaft and the spindle, said means including reversely ar-' ranged pawls forrotating the spindle in opposite directions through-said teeth, a shiftable plate having teeth, means on the plate to alternately lift th'e pawls out ofldriving engagement Withsaid spindle on shifting the plate in opposite 'directions,a member frictionally engaged with the shaftandhaving E teethto engage thoseon the plate to shift the same in oppositedirections on changing the direction rotation of the shaft, and -co acting means on the member and the plate to stop the movementof the plate and the memberupon completingthe shiftingof the plate. 1 r 6. In combination in a portable power driven tool, a rotary spindle having ratcliet teeth, a crankshaft, levers journaled at the spindle and oscillated by the cranks of said shaft,-re'v'ersely arranged pawls carried by thelevers for rotatingthe spindle in oppo site directionsthrough said teeth, a shiftable plate between the levers, cam means on the plate for the pawls, said levers having recesses in their inner sides to accommodate said cam means, and means actuated by the shaft on; changing its directionof rotatation to shift the plate and cause the cam means thereon to alternately lift; thepawls out of driving engagement with thespindle.

T7. In combination in' aportable power driven tool, arotary spindle having ratchet.

teeth, a crank shaft, levers journaled at the spindle and oscillated bythe cranksof said shaft, reversely arranged pawls carried by said levers for rotating the spindle in oppo site directions through said teeth,'a shiftable plate between the levers and havingstrips to lift the pawls,and means actuated by the shaft on changingitsdirection of rotation to shift the plate in opposite directions, said pawls having recesses to receive the" strips so as to reduce the lifting -movement of the pawls toclear the spindle. i l

8.Incombinationina portable power driven tool, a rotary spindle having ratchet teeth, a crank shaft, levers journaled on the spindle and oscillated by the cranks .of said shaft, reversely arranged pa wls on the levers;

for rotating the spindle in opposite directions through said teeth, a shiftable platebe tween the levers, a member frictionall-yengaged with the shaft and actuated thereby to shift the plate in opposite directions on changing the direction of rotation ofsaid shaft,wand means on the plate to alternately lift the "pawls out ofdriving engagement with the spindle in the shifting of the plate, the portion 1 of tlielshaft engaged byfsaid member being concentric with the' rotary axisoftheshaft. r

99111 combination" in a portable power driven toolfarotary spindle having ratchet f:

teeth, a-crank; shaft, levers journaled on the spindle and oscillated by the cranks" offthe sha ftyreversely arranged pawls on the levers for rotating Ithe shaft in opposite directions through said teeth, a. shiftable plate between rite the levers, means actuated by the shaft on changing its direction of the rotation to shift the'plate in opposite directions, segment stripsqon the plate to alternately liftthe pawls out of driving engagement with the spindle in the shifting of the plate, said plate having notches to receive projections on the segment strips, and means for securing the segment strips together and clamping them against the plate.

10.,In combination in a portable power driven tool, a rotary spindle having ratchet teeth, a reversible shaft, means providing a driving connection between the shaft and the spindle,.said means including reversely arranged pawls for turning the spindlein opposite directions through said teeth, ashiftable plate for the pawls, a segment member at theshaft and having means to engage the plate for shifting the same upon reversing the direction of the rotation of the shaft, a spring pressed strap engaged with said member for holding it on the shaft, and frictional material secured to the member and the strap and held thereby against the shaft.

11. A close quarter drill, comprising an elongated outer casing, a rotary spindle transversely disposed in the casing and journaled therein at one end, a reversible motor at the opposite end of the casing, means within the casing and providing a driving connection-between the motor and the spindle, said means including intermittent grip devices for turning the spindle in opposite directions, and means acting automatically on reversing the motor to change the direction of rotation of the spindle through said grip devices.

12. A close quarter drill, comprising an elongated outer casing, a rotary spindle transversely disposed in the casing and journaled therein at one end, a reversible motor at the other end of the casing, a crank shaft journaled within the casing between the motor and the spindle and parallel to the latter, means providing a driving connection between the motor and the shaft, levers ournaled on the spindle and oscillated by the cranks of said shaft, reversely arranged pawls on said levers for rotating the spindle in opposite directions, and means automatically actuated by said shaft on reversing the motor to alternately lift the pawls out of driving engagement with the spindle.

13. In combination in a portable power driven tool, a rotary spindle having ratchet teeth, a crank shaft, levers journaled at the spindle and oscillated by the cranks of said shaft, reversely arranged pawls carried by the levers for rotating the spindle in opposite directions through said teeth, and means influenced by the rotary movement ofsaid shaft on changing its direction of rotation to alternately lift the pawls out of driving engagement with said spindle.

14. In combination, in a portable power driven tool, a rotary spindle having ratchet teeth, a crank shaft, levers journaled at the spindle and oscillatedby the cranks of said shaft, reversely arranged pawls carried by said levers for rotating the spindle in opposite directions through said teeth, a member frictionally engaged with the shaft and turned therewith on changing the direction of rotation' of said shaft, shiftable means shifted by said member as it is turned with the shaft in opposite direct-ions to alternately lift the pawls out of driving engagement with said spindle, and means for limiting the movement'of the member and the shiftable means upon completing the shifting of the latter.

15. In combination in a portable power driven tool, a rotary spindle having ratchet teeth, a crank shaft, levers journaled at the spindle and oscillated by the'cranks of said shaft, reversely-arranged pawls carried by said levers for rotating the spindle in opposite directions through said teeth, a member frictionally engaged with the shaft and turned therewith onchanging the direction of rotation of said shaft, means shifted by said member as it is turned with said shaft for alternately lifting the pawls out of driving engagement with the spindle, and means for adjusting the tension of said member on said shaft.

In testimony whereof I affix my signature.

REINHOLD A. NORLING. 

